Light emitting device

ABSTRACT

A light emitting device includes a package constituted by a molded article having a light emitting face, a bottom face, and a rear face, and a pair of leads partially embedded in the molded article, protrude from the bottom face, and have ends that bend toward either the light emitting face or the rear face. The molded article has a front protruding part that protrudes from the bottom face and includes a surface continuous with the light emitting face, the front protruding part being spaced apart from the rear face, and a rear protruding part that protrudes from the bottom face and includes a surface continuous with the rear face, the rear protruding part being spaced apart from the light emitting face, between the leads on the bottom face, the front protruding part being spaced apart from the rear protruding part.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. patentapplication Ser. No. 13/559,075 filed on Jul. 26, 2012. This applicationclaims priority to Japanese Application No. 2011-167663 filed in Japanon Jul. 29, 2011. The entire disclosures of U.S. patent application Ser.No. 13/559,075 and Japanese Application No. 2010-167663 are incorporatedhereinto by reference.

BACKGROUND

1. Technical Field

The present invention relates to a light emitting device.

2. Related Art

There are conventional light emitting devices with which the width ofthe light emitting component (cavity) of the light emitting device isincreased as much as possible with respect to the width of the lightemitting device by taking out the terminals from directly under thelight emitting component, in order to mount a plurality of side-mountlight emitting devices more densely on a circuit board.

However, with a light emitting device such as this, the package becomestaller, so mounting is unstable because of the high center of gravity.

In view of this, a method has been proposed, for example, for improvingmounting stability by providing a terminal that is bent forward andanother terminal that is bent backward, to balance out the surfacetension of the solder at the front and back of the light emitting device(Patent Literature 1: JP2003-77317-A, etc.).

When terminals are bent forward and backward as with the light emittingdevice discussed above, a problem is that the bending step addscomplexity, and this adversely affects productivity.

Also, in order to bend the terminals forward and backward, the lightemitting device needs to be thick enough to allow both terminals to bedisposed in the depth direction, and this is also a problem in that thelight emitting device cannot be made as compact.

The present invention was conceived in light of the above problems, andit is an object thereof to provide a light emitting device that has highmounting stability, even with a compact light emitting device, withoutany decrease in productivity.

SUMMARY

A light emitting device includes a package constituted by a moldedarticle having a light emitting face, a bottom face that is contiguouswith the light emitting face, and a rear face that is on the oppositeside from the light emitting face, and a pair of leads that arepartially embedded in the molded article, protrude from the bottom face,and have ends that bend toward either the light emitting face or therear face, and a light emitting element that is disposed on one of thepair of leads. The molded article has a front protruding part thatprotrudes from the bottom face and includes a surface that is continuouswith the light emitting face, the front protruding part being spacedapart from the rear face, and a rear protruding part that protrudes fromthe bottom face and includes a surface that is continuous with the rearface, the rear protruding part being spaced apart from the lightemitting face, between the leads on the bottom face, the frontprotruding part being spaced apart from the rear protruding part.

With the present invention, it is possible to provide a light emittingdevice that has high mounting stability, even with a compact lightemitting device, without any decrease in productivity.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1A is a top oblique view of the light emitting device in Embodiment1 of the present invention;

FIG. 1B is a top view (light emitting face) of the light emitting devicein FIG. 1A;

FIG. 1C is a side view of the light emitting device in FIG. 1A;

FIG. 1D is a bottom view of the light emitting device in FIG. 1A;

FIG. 1E is a cross section along the A-A′ line of the light emittingdevice in FIG. 1A;

FIG. 2A is a top oblique view of the light emitting device in Embodiment2 of the present invention;

FIG. 2B is a top view (light emitting face) of the light emitting devicein FIG. 2A;

FIG. 2C is a bottom view of the light emitting device in FIG. 2A;

FIG. 3A is a top oblique view of the light emitting device in Embodiment3 of the present invention;

FIG. 3B is a top view (light emitting face) of the light emitting devicein FIG. 3A;

FIG. 3C is a bottom view of the light emitting device in FIG. 3A;

FIG. 4A is a top oblique view of the light emitting device in Embodiment4 of the present invention;

FIG. 4B is a top view (light emitting face) of the light emitting devicein FIG. 4A;

FIG. 4C is a bottom view of the light emitting device in FIG. 4A; and

FIG. 5 is a simplified cross section of the light emitting device inEmbodiment 5 of the present invention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

An embodiment of the present invention will now be described throughreference to the drawings. In the following description of the drawings,portions that are the same or similar will be given the same or similarnumbers. The drawings are merely schematic illustrations, and theproportions and so forth of the various dimensions may differ from thoseof the actual dimensions.

Embodiment 1

As shown in FIGS. 1A to 1E, the light emitting device in this embodimentmainly comprises a package and a light emitting element 20.

This light emitting device is what is called a side view type. Aside-view light emitting device is a type in which the light emittedfrom the light emitting element is taken out in a direction parallel toa mounting face of a mounting board. These side-view light emittingdevices are generally small in the depth direction, and one of theircharacteristics is they are more prone to toppling forward or backwardthan what is known as a top-view light emitting device.

Package

The package has a molded article 11 composed of a resin, and a pair ofleads 12 and 13 that are partially embedded in the molded article 11.

Molded Article 11

The molded article 11 is usually formed in a substantially cuboid shape,and defines the external shape of the package. The shape of the moldedarticle 11 is not limited to being cuboid, however, and may instead bethat of a polyhedral prism, a polyhedral cone, or some other such shape.This package usually has a light emitting face 11 a, a bottom face 11 cthat is contiguous with this light emitting face 11 a, and a rear face11 b on the opposite side from the light emitting face 11 a. It is alsopreferable for there to be side faces 11 d that are contiguous with thelight emitting face 11 a, the bottom face 11 c, and the rear face 11 b.

The light emitting face 11 a is the face where the light emitted by thelight emitting element 20 is taken out, and has a recess 11 e forinstalling the light emitting element 20.

The molded article 11 is preferably made of a material that iselectrically insulating, is heat resistant, has suitable strength, andis opaque enough to transmit little of the emitted light from the lightemitting element 20, external light, etc. Any thermoplastic resin knownin the past can be used as this material, such as liquid crystalpolymers, polyphthalamide resins, and polybutylene terephthalate. Inparticular, if a semi-crystalline polymer resin containing high-meltingpoint crystals, such as a polyphthalamide resin, is used, the resultingpackage will have high surface energy, and will have good enoughadhesion to light guide plates and so forth that can be attached lateror sealing materials that can be provided inside an opening.Thermosetting resins that are known in this field, such as epoxy resins,modified epoxy resins, silicone resins, and modified silicone resins,can also be used. A white pigment such as titanium oxide or the like canalso be mixed into the material of the molded article in order toreflect the light from the light emitting element more efficiently. Themolded article 11 basically has a front portion 1 if and a rear portion11 r that intersect with one another at a line 11L, as indicated inFIGS. 1C and 1D.

Leads 12 and 13

With a package of a single light emitting device, there is at least onepair of (two) leads 12 and 13, part of which is embedded in the moldedarticle 11. The leads 12 and 13 are partially deformed by bending,curving, or the like. The lead 12 is used to install a light emittingelement and functions as one of the terminals, while the other lead 13functions as the other terminal.

The leads 12 and 13 are exposed from the molded article 11 inside therecess 11 e of the molded article 11, and the exposed faces thereofserve as an installation face for installing the light emitting elementand a connection face with the light emitting element. The leads 12 and13 extend from the installation face or connection face, and protrudefrom the rear face 11 b of the molded article 11. The protruding leads12 and 13 have ends 12 a and 13 a that curve to either the lightemitting face 11 a side or the rear face 11 b side along the rear face11 b of the molded article 11. Also, the ends 12 a and 13 a preferablyhave distal ends 12 b and 13 b that curve along the side faces 11 d ofthe molded article 11. Because the distal ends 12 b and 13 b aredisposed on the side faces of the light emitting device, soldering tothe mounting board is possible at the side faces and the bottom face ofthe light emitting device, and this increases the adhesive strength.

The ends 12 a and 13 a protruding from the bottom face 11 c of themolded article 11 curve to the light emitting face 11 a side.

Also, of the pair of leads 12 and 13, as shown in FIG. 1E, the lead 12on which the light emitting element is installed is preferably providedwith wall components 12 c bent so as to surround the installation faceof the light emitting element. When the wall components 12 c are exposedfrom the molded article 11, they can function as reflectors of the lightemitted from the light emitting element, which prevents thephotodegradation of the molded article around the light emitting elementand increases the light take-off efficiency.

It us usually preferable for the leads 12 and 13 to be made of amaterial with a relatively high thermal conductivity (such as at leastabout 200 W/(m·K)). This allows heat generated from the light emittingelement to be transmitted more efficiently. Examples of such a materialinclude nickel, gold, copper, silver, molybdenum, tungsten, aluminum,iron, and other such metals, and iron-nickel alloys, phosphor bronze,iron-containing copper, and other such alloys, all of which can be usedin one or more layers.

Form of Package

When the light emitting device equipped with the above-mentioned leads12 and 13 is mounted as a side-view type, the center of gravity of thelight emitting device (and particularly the leads) may be shifted to theside on which the ends 12 a and 13 a of the leads 12 and 13 are bent,for example, and this tends to make toppling more the light emittingdevice likely to side on which the ends 12 a and 13 a are bent.

Therefore, to prevent an unstable state of the light emitting elementcaused by this imbalance in the center of gravity, etc., the moldedarticle 11 comprises a front protruding part 14 a that protrudes on thelight emitting face 11 a side and a rear protruding part 14 b thatprotrudes on the rear face 11 b side, between the leads 12 and 13 on thebottom face 11 c. As shown in FIG. 1D, the front protruding part 14 aextends along the bottom face 11 c from the light emitting face 11 a tothe line 11L, ending at the line 11L, and therefore does not extendbeyond the line 11L toward the rear face 11 b. Further, an end surfaceof the front protruding part 14 a is continuous with the light emittingface 11 a, as is shown in FIGS. 1A and 1D. The rear protruding part 14 bextends along the bottom face 11 c from the rear face 11 b to the line11L, ending at the line L, and therefore does not extend beyond the line11L toward the light emitting face 11 a. Further, an end surface of therear protruding part 14 b is continuous with the rear face 11 b, asshown in FIG. 1C. Also, as shown in FIG. 1D, there are two of the rearprotruding parts 14 b with the front protruding part 14 a being betweenthe two rear protruding parts 14 b. However, the front protruding part14 a is offset from the rear protruding parts 14 b and spaced aparttherefrom defining a staggered pattern, with the front protruding part14 a being located on the front portion 11 f of the molded article 11and the rear protruding parts 14 b being located on the rear portion 11r.

One or more of each of the front protruding part 14 a and the rearprotruding part 14 b may be formed in a single molded article 11. Ifthere are more than one of either of these, the front protruding part 14a and the rear protruding part 14 b are preferably disposed in analternating pattern in the width direction of the light emitting device(for example, the W direction in FIG. 1A).

If the front protruding part 14 a and the rear protruding part 14 b aredisposed adjacent to (near) the above-mentioned lead ends 12 a and 13 a,then it is preferable if at least the adjacent front protruding part 14a and rear protruding part 14 b are disposed on a different side fromthe side on which the lead ends are bent. That is, in FIG. 1A, since thelead end 12 a is disposed on the light emitting face 11 a side, it ispreferable if the rear protruding part 14 b that protrudes on the rearface side is disposed adjacent to the lead end 12 a thereof.

As shown in FIGS. 1A and 1B, the front protruding part 14 a and the rearprotruding part 14 b each need only be shifted to the light emittingface 11 a side or the rear face 11 b on the bottom face, and the end oredge of the molded article 11 does not necessarily have to coincide withthe end or edge of the front protruding part 14 a and rear protrudingpart 14 b.

There are no particular restrictions on the length of the frontprotruding part 14 a and the rear protruding part 14 b in the depthdirection of the molded article 11 (the arrow D direction in FIG. 1A) ortheir length in the width direction (the arrow W direction in FIG. 1A),and these lengths can be suitably adjusted as dictated by the size ofthe light emitting device. The lengths of the front protruding part 14 aand the rear protruding part 14 b in the D and W directions may be thesame or different from each other. In particular, the length D of thefront protruding part 14 a and the rear protruding part 14 b in thedepth direction of the molded article 11 is preferably a lengthequivalent to the edge from the position where the leads 12 and 13protrude from the bottom face 11 c to the light emitting face 11 a orthe rear face 11 b. The length W in the width direction is, for example,about 1/20 to ⅕ the width of the molded article 11, and preferably about1/10 to ⅕.

There are no particular restrictions on the length H of the frontprotruding part 14 a and the rear protruding part 14 b in the heightdirection of the molded article 11 (the arrow H direction in FIG. 1A),as long as the height allows the mounting of the leads 12 and 13, butthe height is preferably set so as to constitute substantially the sameplane as that of the ends 12 a and 13 a of the bent leads 12 and 13(that is, a plane corresponding to the bottom face at the ends 12 a and13 a). The phrase “substantially the same plane” means that the heightdifferential between the two falls within about ±10% of the height ofthe front protruding part 14 a and the rear protruding part 14 b.

Thus providing the front protruding part 14 a and the rear protrudingpart 14 b improves the mounting stability of the light emitting device.In particular, when these are disposed in an alternating pattern, theycan be mounted more stably. Furthermore, mounting stability is evenbetter when the height of the front protruding part 14 a and the rearprotruding part 14 b constitutes the same plane as that of the ends 12 aand 13 a of the bent leads 12 and 13.

Also, because the front protruding part 14 a and the rear protrudingpart 14 b are present between the leads, there is no danger that thesolder connecting the positive and negative leads 12 and 13 will spreadout and join together.

Light Emitting Element 20

The light emitting element 20 is disposed on the bottom face of therecess of the molded article. Since the leads 12 and 13 are exposed atthe bottom face as mentioned above, one electrode of the light emittingelement 20 is electrically connected and installed on the surface of thelead 12, in particular. The other electrode of the light emittingelement 20 is electrically connected to the other lead 13 disposed toform a pair with the lead 12. The light emitted from the light emittingelement goes out through the light emitting face 11 a to the outside ofthe package.

A light emitting diode having GaAlN, ZnS, SnSe, SiC, GaP, GaAlAs, AlN,InN, AlInGaP, InGaN, GaN, AlInGaN, or another such semiconductor as alight emitting layer on a substrate can be used to advantage as thelight emitting element 20.

Sealing Resin 30

With the light emitting device of the present invention, the recess ofthe molded article 11 is usually filled with a sealing resin 30 to sealthe light emitting element 20. The sealing resin 30 is preferably aresin that is translucent, examples of which include polyolefin resins,polycarbonate resins, polystyrene resins, epoxy resins, acrylic resins,acrylate resins, methacrylic resins (PMMA, etc.), urethane resins,polyimide resins, polynorbornene resins, fluororesins, silicone resins,modified silicone resins, and modified epoxy resins. This material maycontain one of the known fluorescent substances discussed, for example,in WO 2006/038502, Japanese Laid-Open Patent Application 2006-229055 orelsewhere, pigments, fillers, dispersants, or the like.

To obtain the light emitting device in this embodiment, for example, acopper sheet (silver plated) is prepared in a specific thickness (about0.1 to 1.0 mm, such as about 0.5 mm), and this is punched out in thedesired shape. This forms a plurality of metal sheets whose shape of thedesired units is contiguous in a specific direction, as shown in FIG.2A.

After this, the metal sheets are molded with a resin material (thematerial of the molded article 11) by transfer molding or another suchmethod. Recesses corresponding to the front protruding part and rearprotruding part are provided to the upper and lower molds here. Thisforms a package array in which the leads 12 are embedded in resinmaterial. In this package array, part of each individual lead 12 isexposed at the bottom part of the recess formed in the light emittingface 11 a of the molded article 11, and the front protruding part 14 aand the rear protruding part 14 b are formed at positions correspondingto the bottom face of the molded article 11.

Next, the package array is cut into units by a dicing saw. This cuts outa plurality of light emitting devices from the package array.

It is generally preferable to ensure good moldability by giving thewalls of the molds a shape that allows the molded article to be easilyremoved after molding (such as a tapered shape or a textured shape), andalong with this, a tapered shape and/or a textured shape may betransferred to the surface shape of the molded article.

Embodiment 2

As shown in FIGS. 2A to 2C, the light emitting device in this embodimentis the same as the light emitting device in Embodiment 1 in that itcomprises a light emitting element (not shown) and a package having amolded article 21 composed of resin and a pair of leads 12 and 13 thatare partially embedded in this molded article 21.

The leads 12 and 13 protrude from the bottom face 21 b of the moldedarticle 21, and the protruding leads 12 and 13 have ends 12 a and 13 athat are bent to a light emitting face 21 a side along the bottom faceof the molded article 21. Also, ends 12 a and 13 a have distal ends 12 band 13 b that are bent along side faces 21 d of the molded article 21.

The molded article 21 comprises one each of a front protruding part 24 athat protrudes on the light emitting face 21 a side and a rearprotruding part 24 b that protrudes on the rear face 21 b side, betweenthe leads 12 and 13 on the bottom face 21 c, and near each of the leads12 and 13.

The light emitting device in this embodiment substantially has the samebasic constitution as the light emitting device in Embodiment 1, exceptthat the number of front protruding part 24 a and rear protruding part24 b and their positions are different. Therefore, in Embodiment 2, justas in Embodiment 1, providing the front protruding part 24 a and therear protruding part 24 b improves the mounting stability of the lightemitting device. Also, there is no danger that the solder connecting thepositive and negative leads 12 and 13 will spread out and join together.

Embodiment 3

As shown in FIGS. 3A to 3C, the light emitting device in this embodimentis that same as the light emitting device in Embodiment 1 in that itcomprises a light emitting element (not shown) and a package having amolded article 31 composed of resin and a pair of leads 32 and 33 thatare partially embedded in this molded article 31.

The leads 32 and 33 protrude from the bottom face 31 b of the moldedarticle 31, and the protruding leads 32 and 33 have ends 32 a and 33 athat are bent to a light emitting face 31 a side along the bottom faceof the molded article 31. Also, ends 32 a and 33 a have distal ends 32 band 33 b that are bent along side faces 31 d of the molded article 31.

The lead 32 has an installation face for installing a light emittingelement disposed inside the molded article 31, extends in one directionfrom this installation face, protrudes from the bottom face 31 b of themolded article 31 to form the end 32 a and the distal end 32 b, and alsoextends in another direction of the installation face, such as from alocation that is opposite in one direction, protrudes from between theleads 32 and 33 on the bottom face 31 b of the molded article 31, andconstitutes a third lead end 32 d.

The third lead end 32 d is preferably bent in the same direction as thedirection in which the ends 32 a and 32 b of the pair of leads 32 and 33are bent.

The fact that the third lead end 32 d protrudes from inside the moldedarticle 31 in a state of branching off from the lead where the lightemitting element is disposed (out of the pair of leads 32 and 33) insidethe molded article 31 as discussed above is an advantage in that itensures a path for heat to be transmitted to the outside, but the thirdlead end 32 d may be disposed separately from the leads 32 and 33 andprotrude from inside the molded article 31. Also, the fact that thethird lead end 32 d has a relatively large surface area inside andoutside the molded article 31 is an advantage in that heat transmissionis improved, so this surface area is preferably made as large aspossible to the extent that this does not lead to an increase in thesize of the light emitting device. To this end, for example, it ispreferably formed wider inside the molded article 31 and at least nearthe bottom face 31 c, and protrudes from the bottom face 31 c with thisincreased width maintained. The length of the third lead end 32 d in thewidth direction in this case (see the arrow W in FIG. 1A) may be about1/10 to 1/1.5 the width of the molded article 31, and preferably about ⅕to ½.

In this embodiment, the molded article 31 comprises one each of thefront protruding part 34 a that protrudes on the light emitting face 31a side and the rear protruding part 34 b that protrudes on the rear face31 b side, near the leads 32 and 33, between the leads 32 and 33 on thebottom face 31 c, and between the end 33 a and the third lead end 32 d,in substantially the same manner as in Embodiment 2.

The light emitting device in this embodiment substantially has the samebasic constitution as the light emitting device in Embodiment 2, exceptthat it further comprises the above-mentioned third lead end 32 d.Therefore, in Embodiment 3, just as in Embodiments 1 and 2, providingthe front protruding part 34 a and the rear protruding part 34 bimproves the mounting stability of the light emitting device. Also,there is no danger that the solder connecting the positive and negativeleads 12 and 13 will spread out and join together.

Embodiment 4

As shown in FIGS. 4A to 4C, the light emitting device in this embodimentis the same as the light emitting device in Embodiment 1 in that itcomprises a light emitting element (not shown) and a package having amolded article 41 composed of resin and a pair of leads 42 and 43 thatare partially embedded in this molded article 41.

The leads 42 and 43 protrude from the bottom face 41 b of the moldedarticle 41, and the protruding leads 42 and 43 have ends 42 a and 43 athat are bent to a light emitting face 41 a side along the bottom faceof the molded article 41. Also, ends 42 a and 43 a have distal ends 42 band 43 b that are bent along side faces 41 d of the molded article 41.

The lead 42 has an installation face for installing a light emittingelement disposed inside the molded article 41, extends in one directionfrom this installation face, protrudes from the bottom face 41 b of themolded article 41 to form the end 42 a and the distal end 42 b, and alsoextends in another direction of the installation face, such as from alocation that is opposite in one direction, protrudes from between theleads 42 and 43 on the bottom face 41 b of the molded article 41, andconstitutes a third lead end 42 d. The third lead end 42 d here branchesinside the molded article 41, branching in two at the bottom face 41 cand protruding from the molded article 41.

The length of the third lead end 42 d in the width direction (see thearrow Win FIG. 1A) may be about 1/20 to ⅓ the width of the moldedarticle 41, and preferably about 1/10 to ¼.

The third lead end 42 d is preferably bent in the same direction as thedirection in which the ends 42 a and 42 b of the pair of leads 42 and 43are bent.

This third lead end 42 d may also branch off from the lead where thelight emitting element is disposed inside the molded article 41, and maybe separate from the pair of leads 42 and 43.

In this embodiment, the molded article 41 comprises one each of thefront protruding part 44 a that protrudes on the light emitting face 41a side and the rear protruding part 44 b that protrudes on the rear face41 b side, between the leads 42 and 43 on the bottom face 41 c, betweenthe end 43 a and one of the third lead ends 42 d, between the end 42 aand the other third lead end 42 d, and between the two third lead ends42 d, in substantially the same manner as in Embodiment 1.

The light emitting device in this embodiment substantially has the samebasic constitution as the light emitting device in Embodiments 1 and 3,except for further comprising the above-mentioned third lead end 42 d.Therefore, in Embodiment 4, just as in Embodiments 1 and 3, providingthe front protruding part 44 a and the rear protruding part 44 bimproves the mounting stability of the light emitting device. Also,there is no danger that the solder connecting the positive and negativeleads 42 and 43 will spread out and join together.

Embodiment 5

As shown in FIG. 5, the light emitting device in this embodiment is aside-view light emitting device that mainly comprises a package and alight emitting element 20.

A molded article 51 constituting part of the package is itselfsubstantially the same as in Embodiment 1, etc.

Of the pair of leads constituting part of the package, a lead 52 wherethe light emitting element is installed is such that the portion aroundthe light emitting element installation face is worked into a recessedshape, the bottom of the recess corresponds to the installation face,and walls 52 c are disposed so as to surround this area. The walls 52 c,just as in Embodiment 1, prevent photodegradation around the lightemitting element and increase the light takeoff efficiency.

This lead 52 extends from the installation face and protrudes from thebottom face 51 b of the molded article 51. The protruding lead 52 has anend 52 a that is bent to the rear face 51 b side along the bottom face51 c of the molded article 51.

Also, the end 52 a preferably has a distal end 52 b that is bent alongthe side face 51 d of the molded article 51.

The other lead 53 extends from the connection face, protrudes from thebottom face 51 b of the molded article 51 just as the lead 52 does, andhas an end 53 a and a distal end 53 b that are bent to the rear face 51b side.

This molded article 51 comprises a front protruding part (not shown)that protrudes on the light emitting face 51 a side, and a rearprotruding part (not shown) that protrudes on the rear face 51 b side,between the leads 52 and 53 of the bottom face 51 c.

Two of the front protruding parts are disposed near the lead ends 52 aand 53 a, and one rear protruding part is disposed near the centerbetween these front protruding parts. That is, the front protrudingparts and the rear protruding part are each disposed on a different sidefrom the side on which at least the adjacent lead end is bent.

The light emitting device in this embodiment is substantially the sameas the basic constitution of the light emitting device in Embodiment 1,except that the form of the light emitting device installation face ofthe lead 52 and the direction in which the lead end is bent aredifferent, and along with this the positions of the front protrudingparts and the rear protruding part have shifted. Therefore, inEmbodiment 5, just as in Embodiment 1, providing the front protrudingparts and the rear protruding part increases the mounting stability ofthe light emitting device. Also, there is no danger that the solderconnecting the positive and negative leads will spread out and jointogether.

What is claimed is:
 1. A side-view type light emitting devicecomprising: a light emitting element, a pair of leads that is connectedto the light emitting element; a molded article formed in asubstantially cuboid shape, embedding a part of the pair of leads, andincluding a width direction, a depth direction, a depth in the depthdirection, a front portion, a rear portion, and a plurality ofprotruding parts; the protruding parts including at least one frontprotrusion and at least one rear protrusion; the front portion includinga front face, a recess, a bottom, and the at least one front protrusion,the recess in a substantially rectangular shape in a planar view on thefront face, the at least one front protrusion protruding from the bottomof the front portion and including a first length in the depth directionof the molded article; the rear portion including a bottom and the atleast one rear protrusion, the at least one rear protrusion protrudingfrom the bottom of the rear portion and including a second length in thedepth direction of the molded article; the protruding parts disposedoffset in the width direction from one another, the sum of the firstlength and the second length are equal to the depth of the moldedarticle, and at least one of the pair of leads is disposed between theprotruding parts.
 2. The side-view type light emitting device of claim1, wherein among the at least two protruding parts, an end face of atleast one of the protruding parts is disposed on the same plane as endfaces of the pair of leads.
 3. The side-view type light emitting deviceof claim 1, wherein an end face of one of the protruding parts isdisposed on the same plane as an end face of another of the protrudingparts.
 4. The side-view type light emitting device of claim 1, whereinthe pair of leads protrude from the bottom face of the molding article,at least one of the pair of leads protruding from the bottom face isdisposed between the protruding parts.
 5. The side-view type lightemitting device of claim 1, wherein at least one of the protruding partsis disposed between the pair of leads.
 6. The side-view type lightemitting device of claim 1, wherein end faces of the pair of leads aredisposed on the same plane.
 7. The side-view type light emitting deviceof claim 1, wherein one of the protruding parts protrudes from asubstantially cuboid outline of the molded article.
 8. The side-viewtype light emitting device of claim 1, wherein a height of theprotruding parts from the bottom face of the molded article is equal toor larger than height of the pair of leads from the bottom face of themolded article.
 9. A molding product comprising: a pair of leads; amolded article formed in a substantially cuboid shape, having a windowin a substantially rectangular shape, embedding a part of the pair ofleads, and including a width direction, a depth direction, a depth inthe depth direction, a front portion, a rear portion, and a plurality ofprotruding parts; the protruding parts including at least one frontprotrusion and at least one rear protrusion; the front portion includinga bottom and the at least one front protrusion, the at least one frontprotrusion protruding from the bottom of the front portion and includinga first length in the depth direction of the molded article; the rearportion including a bottom and the at least one rear protrusion, the atleast one rear protrusion protruding from the bottom of the rear portionand including a second length in the depth direction of the moldedarticle; the protruding parts disposed offset in the width directionfrom one another, the sum of the first length and the second length areequal to the depth of the molded article, and at least one of the pairof leads is disposed between the two protruding parts.
 10. A side-viewtype light emitting device comprising: a light emitting element, a pairof leads that is connected to the light emitting element; a moldedarticle embedding a part of the pair of leads, and including a depthdirection, a width direction, a front portion, a rear portion, and aplurality of protruding parts; the protruding parts including at leastone front protrusion and at least one rear protrusion; the front portionincluding a bottom and the at least one front protrusion, the at leastone front protrusion protruding from the bottom of the front portion andincluding a first length in the depth direction of the molded article;the rear portion including a bottom and the at least one rearprotrusion, the at least one rear protrusion protruding from the bottomof the rear portion and including a second length in the depth directionof the molded article; the protruding parts disposed offset in the widthdirection from one another, and an end face of the at least one rearprotrusion is disposed on the same plane as an end face of the at leastone front protrusion.
 11. The side-view type light emitting device ofclaim 10, wherein at least one of the pair of leads is disposed on thesame plane as an end face of the rear face of the front protruding part.12. The side-view type light emitting device of claim 10, wherein a pairof the leads are exposed from the molded article and extend toward afront face, a length of one of the pair of leads which is exposed fromthe molded article and extends toward a front face is shorter thanlength from a rear face to a front face of the at least one frontprotrusion.
 13. The side-view type light emitting device of claim 10,wherein the first length is greater than the second length.